Update changelog 2025.3.100 (#7020)

Author: debonte

CHANGELOG.md

@@ -1,10 +1,17 @@
 # Changelog
 
+## 2025.3.100 (6 March 2025) PreRelease
+
+Notable changes:
+
+-   Testing release pipeline.
+
 ## 2025.3.1 (5 March 2025) Release
 
 Notable changes:
 
 -   Release version that includes changes through the [2025.2.103](https://github.com/microsoft/pylance-release/blob/main/CHANGELOG.md#20252103-3-march-2025-prerelease) prerelease build.
+-   Enhancement: Add \ when adding line breaks in strings in the middle of assignments [pylance-release#7002](https://github.com/microsoft/pylance-release/issues/7002)
 
 ## 2025.2.103 (3 March 2025) PreRelease